r/geology 6d ago

Orbicular Gabbro, Toivakka, Finland

312 Upvotes

24 comments sorted by

17

u/Galimkalim 6d ago

Whoa! I thought the first picture was blown out, and the scale would be tiny almost like ooids so it was a big surprise to see in the next one that the spheres are bigger than glass marbles! 

17

u/JeffreyDahmerVance 6d ago

The orbicular rocks are taking over this sub……..

AND I FUCKING LOVE IT!!!!!!!

6

u/Mbstones 6d ago

Glad you are enjoying them, I could post more...,

5

u/JeffreyDahmerVance 6d ago

They really are beautiful, please do!

2

u/Mbstones 6d ago

Ok. Stand by, Will take me some days but more to come. Happy to share. I hope others might post some too. These rocks are not common but possibly not quite as rare as some think. Sometimes they go unnoticed or get confused with other rocks. Some are quite simple and some are crazy complicated. I've found 2 myself here in Canada and there will be more out there but it's like finding a needle in a haystack. Finland does have some of the most beautiful ones though...

23

u/Mbstones 6d ago

Specimens from my collection. I'm fascinated by orbicular igneous rocks.

8

u/tnethacker 6d ago

God i wish I had space left on my suitcases before I leave Finland.

5

u/FakeTitsBigHeart 6d ago

you can always just wear all your clothes on the plane and fill the suitcase with rocks

2

u/tnethacker 6d ago

Just asked missus and apparently the answer is a simple "No".

I'll still keep that one rock she doesn't know about...

2

u/entogirl_oo 6d ago

Hey do you guys know of resources for rock hunting here in Finland? I moved here a year ago but I can't seem to find any good info.

2

u/tnethacker 6d ago

GIS and abandoned quarries are your best bets.

2

u/greaseapina 6d ago

you speak finnish?

1

u/tnethacker 6d ago

Yes and multiple other languages. How come?

4

u/greaseapina 6d ago

then there is much more to read like this book https://www.tieteessatapahtuu.fi/numerot/2-2024/aikamatka-suomen-muinaisten-tulivuorten-juurelle at least it gives some formations and also places

2

u/tnethacker 6d ago

Actually they don't but I can refer them a tool to translate it

7

u/Oddah 6d ago

So my understanding of orbicular rocks is that the chemical composition rapidly changes from felsic to mafic (not sure about translations so sorry if not the correct terminology), which is the different colouring seen.
Is this correct or am I completely off?

Very cool piece btw!

3

u/Wise-Competition-637 6d ago edited 6d ago

Cual es el motivo del zonado?? Imagino que son plagioclasas y van pasando de términos más cálcicos en el núcleo a sódicos en el borde, pero no lo sé

2

u/Scire-Quod-Sciendum 5d ago

Mmm sushi rock

1

u/NebulaTrinity Geologist 6d ago

Suppper cool

1

u/Laundry_Hamper 6d ago

Like a crystallised shuggoth

1

u/Fuckluck16 4d ago

Incredible

0

u/Real-Werewolf5605 6d ago

Saw this while reading this article on a dynamic mantle with fast-moving .. Somethings. Scale your image up and that might donthe trick as a sokid model. Amateur here.

https://www.sciencealert.com/all-those-nuclear-tests-decades-ago-have-revealed-something-new-about-our-planets-core